He tries to reason with her

"Mom, thanks to my relationships, you have a new job, a better job than you had before. You won't have some boss drooling over you while you work. You have a chance to learn some skills and the possibility of a great promotion. All because Cindi wanted to be the best girlfriend she could be... which includes sucking my dick along with her sister. Now, I know that goes against your religious background but what the hell has your religion ever gotten you? It's made you miserable, **** you to stay in a relationship you didn't want while the man you were married to went out and fucked any number of other women."

"But Matt, the Bible says--"

"Says what? That men can have as many wives and concubines as they want? Well, it does say that, doesn't it? Does it say that women should be subservient? Well, why don't you try that, at least for a while."

Tears glistened in her eyes then dribbled down her cheeks. "I just worry, Matt. When I saw you with those two naked girls I was sure that you'd ruined everything."

"I understand." He stroked her knee. "Of course you were concerned. You didn't understand that Mrs. Phuan was also brought up in a traditional environment where the male is given complete deference. But now you do. Now you see that I'm making the decisions we have to make to keep our family going. Your job won't be enough, you know. Without dad's contributions, Karen and I are going to have to do more... and we're going to need your support, not you tearing us down. I can count on you for that, can't I?

She nodded slowly. "I guess I was raised in an environment of complete deference to the male as well. I'm not sure it's right but I guess I'll keep doing it for now. Until you screw up, mister."

He laughed and squeezed her knee. "That's fair. Now let's go in and tell Karen the good news." He also suspected she'd very much be interested in the dildo experimentation.